The idle air bleed on some models is found in the venturi instead of in the usual location. Some models take idle air from both positions at the same time.

of this manual relating to the secondary systems. The primary side of these models functions the same as the secondary side of other 4150 models.

(5) BY-PASS IDLE SYSTEM - 4160 WITH MECHANICAL SECONDARYS -This model incorporates a by-pass idle system. Air passes thru an opening into the main body cavity where it is metered into the intake manifold by means of the

(4) MODEL - 4150G AND 4150MG - On these two models the idle adjusting needles are located in the secondary metering block on the secondary side and will be explained in the portion